Difference between revisions of "Topics:PCG Portfolio"

From PCGSCMP
Jump to: navigation, search
Line 4: Line 4:
 
;Crystal structures and their transformations
 
;Crystal structures and their transformations
  
Space Group Symmetry  
+
* Space Group Symmetry  
Symmetry lowering
+
* Symmetry lowering
Structural phase transitions – Landau theory
+
* Structural phase transitions – Landau theory
Representation analysis
+
* Representation analysis
Tensors in crystallography
+
* Tensors in crystallography
Charge density
+
* Charge density
Modulated crystal structures – Superspace group approach
+
* Modulated crystal structures – Superspace group approach
  
Elastic properties
+
;Elastic properties
  
 
• Strain-stress relations
 
• Strain-stress relations

Revision as of 09:51, 2 March 2007

PCG – Educational portfolio

Crystal structures and their transformations
  • Space Group Symmetry
  • Symmetry lowering
  • Structural phase transitions – Landau theory
  • Representation analysis
  • Tensors in crystallography
  • Charge density
  • Modulated crystal structures – Superspace group approach
Elastic properties

• Strain-stress relations • Pressure effects

Bulk properties

• Thermal expansion in crystals • Atomic displacement parameters: relationship with phonons and specific heat.

Magnetic structures

• Description of magnetic structures – propagation vectors • Magnetic symmetry analysis – irreps and coreps • Spin density determination with polarised neutrons. • XYZ and spherical polarimetry applied to crystalline materials

Microstructure analysis

• Strain effects • Particle size and distribution • Stacking faults • Texture

Diffraction methods

• CW neutron and x-rays • TOF neutrons • Energy dispersive x-rays • Diffraction imaging – TEDDI etc. • Time-resolved crystallography • Crystallography under high pressure • High-magnetic-field crystallography • SX techniques: Laue, time-sorted Laue…

Data analysis

• Refinement of structural parameters –least square – Rietveld • Direct-space methods – simulated annealing • Single-crystal techniques – twinning

Instrumentation

• Diffraction geometries • Principles of TOF/CW instrument design • Detector technologies of X-rays and neutrons